Estimation of gamma phase composition in nickel-base superalloys (based on geometric analysis of a four-component phase diagram)

The gamma-gamma prime region of the nickel-aluminum-chromium-titanium system at 750' C has been analyzed through the use of phase rule principles and analytic geometry to allow estimation of gamma phase composition when the composition of a two-phase quaternary alloy is known. By application of currently used phase computation methods with the above calculation, the gamma phase composition of several nickel-base super-alloys was estimated and found (except for tungsten) to be in good agreement with compositions for these alloys as reported in the literature.Includes bibliographical references (p. 19-20).The gamma-gamma prime region of the nickel-aluminum-chromium-titanium system at 750' C has been analyzed through the use of phase rule principles and analytic geometry to allow estimation of gamma phase composition when the composition of a two-phase quaternary alloy is known. By application of currently used phase computation methods with the above calculation, the gamma phase composition of several nickel-base super-alloys was estimated and found (except for tungsten) to be in good agreement with compositions for these alloys as reported in the literature.Mode of access: Internet